Herbert von Karajan conducts post mortem a sound construct with six oscillators which reacts to light-dark differences and movement . This work can also be seen as a homage to Herbert von Karajan and Lev Sergeyevich Termen . The theremin , originally known as the ætherphone, is one of the few instruments that is played without physical contact – in the video installation , a modified light-sensitive device , a so called LDR Theremin is used . This device is very responsive to light dark differences modulating the pitch and other hand the volume of an oscillator . The sensors of the LDR theremin are mounted directly on the TV screen of a monitor . By the conducting movements Herbert von Karajans on the screen, he is creating an entirely new symphony.